Printing cellulose acetate



Patented 28, 1942 UNITED. STATES. PATENT OFFICE Charles Franklin Miller, Wilmington, Del, assignor to E. L du Pont de Nemonrs & company,

Wiimingto n, M, a corporation of Delaware s. Drawing. Annealed July 0, 1040, Serial No. 344,404

'IClaims. '(01. -0:)

generally speaking, by printing cellulose acetate.

with acid or direct color with an aqueous medium containing the color, a hydrotroplcally active agent of a'particular class, and zinc thiocyanate. Although I do not wish to be limited to any particular theory of operation, it appears that, by reducing the state oi aggregation of the acid or direct color in an aqueous medium containing zinc thiocyanate, and applying the medium to cellulose acetate, there is produced a greatly improved printing. It is my surprising discovery that thiocyanates in general do not produce the invention and that hydrotropical agents in general do not produce the invention, but that the invention is produced by the combination of zinc thiocyanates with hydrotropical agents of the following classes: urea, thiourea, soluble metal salts of aliphatic surfuric or sulfonic acids of one to twelve carbon atoms, soluble metal salts oi aromatic sulfonic acids which may contain hydroxy, nitro, or halogen substituents in the nucleus, soluble metal salts of aryl, alkyl or aralkyl thioglycollic acid. The alkali earth thiocyanates, the organic thiocyanates, and the ammonium, iron, cadmium, tin, and manganese thiocyanates all have objectionable features.

Among the hydrotropical compounds the following are named as exemplary: sodium ethyl butyl phthalate, sodium N. octyl sulfate, sodium N. propyl surfate, N. isopropyl sulfate, sodium N. hexyi phthalate, sodium tetraline sulfonate, sodium para phenol sulfonate, potassium alpha naphthalene sulfonate, sodium benzyl thioglycolate, sodium methyl adipate, sodium benzyl succinate, sodium isobutyl sulfate, thio urea, sodium N-butyl sulfonate, zinc p-toluene 'sulfonate.

Among the advantages that are gained by my invention are freedom from gas fume fading,

greater freedom irom "crocking" and sublimaor with the assistants singly.

Example 11 Parts by weigh I Acid color dyestuii-C. I. #430 3.00 Sodium para toluene sulfonate 10.00 Zinc thiocyanate 10.00 Water 17.00 50% British gum 60.00

' ished' as in Example tion on steaming, greater range oi. colors and.

greater choice oi colors and greater strength.

The following examples illustrate the invention but do not limit it:

Example I Parts by weight Direct color dyestuil-C. I. #814.......... 3.00 Urea 15.00 Zine thiocyanate.....--..-.-...-. 10.00 Water 12.00 Thickening-50% British gum- 60.00

The above described printing paste is printed on acetate process rayon, dried, steamed minutes in a'cottage steamer," soaped lightly and dried giving a bright, even yellow design which is many timesstron'ger than can be obtained with the above dyestui! without the assistants The described printing paste is printed'and fin- The described printing paste was printed and finished as in Example I, giving a brilliant violet design.

Example IV v Parts by weight Acid color dyestuii-C. I. #216 3. 00 Potassium methyl pentanol phthalate--- 5. 00 Zinc thiocyanate 10. 00 Water 22. 00 50% British gum 60. 00

I giving a clear, brilliant The described printing paste was printed and finished as in Example I, giving a bright orange design.

The following colors, when treated in the manner described, also illustrate the invention:

5.--Direct color dyestuff-C. I. 813 6.Direct color dyestufl-C. I. 561 '7.-Direct color dyestuff-C. I. 581 8.--Direct color dyestuiI-C. I. 812 9.Acid color dyestufl C. I. 30'1 10.Acid color dyestui! -C. I. 289 l1.Acid color dyestufl C. I. 666 12.Acid color dyestufl C. I. #1080 13. Acid color dyestuff C. I. #1088 14.Direct color dyestufl-C. I. 620 15.--Direct color dyestuiIC. I. 816 16.Acid color dyestuif ---C. I. 670

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to FEEWWWWE be understood that I do not limit myself to the fonic acids having up to twelve carbon atoms,

soluble metal salts of aromatic sulfonic acids. soluble metal salts of aryl, alkyl, and aralkyl thioglycollic acids, and soluble meta salts of alkyl, aryl and aralkyl dicarboxylic acid mono-esters and printing the cellulose acetate with the said aqueous medium containing the dyestufl.

, 2. The process of printing cellulose acetate with acid and direct dyestufl which comprises incorporating the dyestuff in an aqueous medium containing zinc thiocyanate and a hydrotropical agent from a class consisting of urea, thiourea; soluble metal salts of aliphatic sulfuric acids having up to 12 carbon atoms, soluble metal salts of aliphatic sulfonic acids having up to 12 carbon atoms, soluble metal salts of aromatic sulfonic acids,.s0lub1e metal salts of aryl, alkyl, and are!- kyl thioglycollic acids, and soluble metal salts of aryl, alkyl, and aralkyl dicarboxylic acid monoesters. 3. The process of printing cellulose acetate with acid and direct dyestuffs which comprises incorporating the dyestufl in an aqueous medium containing zinc thiocyanate and a compound of the class consisting of soluble metal salts of alkyl, aryl, and aralkyl dicarboxylic acid mono esters.

4. The process of printing cellulose acetate with acid and direct dyestuifs which comprises incorporating the dyestufl in an aqueous medium containing zinc thiocyanate and a soluble metal salt of a phthalic acid mono-ester.

5. The process of printing cellulose acetate with acid and direct dyestufls which comprises incorporating the dyestufl in an aqueous medium containing zinc thiocyanate and sodium ethyl butyl phthalate.

8. The process of printing cellulose acetate with acid and direct dyestufls which comprises incorporating the dyestui! in an aqueous medium containing zinc thiocyanate and sodium-N-hexyl phthalate. I

'7. The process of printing cellulose acetate with acid and direct dyestuffs which comprises incorporating the dyestuff in an aqueous medium containing zinc thiocyanate and potassium methyl pentanol phthalate. I

CHARLES FRANKLIN MILLER. 

